package com.cy.pj.sys.service.realm;

import com.cy.pj.sys.dao.SysMenuDao;
import com.cy.pj.sys.dao.SysRoleMenuDao;
import com.cy.pj.sys.dao.SysUserDao;
import com.cy.pj.sys.dao.SysUserRoleDao;
import com.cy.pj.sys.entity.SysUser;
import io.micrometer.core.instrument.util.StringUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationException;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

//import org.apache.shiro.authz.AuthorizationInfo;

@Component
public class ShiroUserRealm extends AuthorizingRealm {
    @Autowired
    private SysUserDao sysUserDao;
    @Autowired
    private SysUserRoleDao sysUserRoleDao;
    @Autowired
    private SysRoleMenuDao sysRoleMenuDao;
    @Autowired
    private SysMenuDao sysMenuDao;

    /*设置凭证匹配器*/
    @Override
    public void setCredentialsMatcher(CredentialsMatcher credentialsMatcher){
        //构建凭证匹配对象
        HashedCredentialsMatcher cMatche=new HashedCredentialsMatcher();
        //设置加密算法
        cMatche.setHashAlgorithmName("MD5");
        //设置加密次数
        cMatche.setHashIterations(1);
        super.setCredentialsMatcher(cMatche);
    }

    /*负责认证信息的获取和封装*/
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(
            AuthenticationToken token)
            throws AuthenticationException {
        //获取用户名
        UsernamePasswordToken upToken= (UsernamePasswordToken) token;
        String username=upToken.getUsername();
        //基于用户名查询用户信息
        SysUser user=sysUserDao.findUserByUserName(username);
        //判定用户是否存在
        if (user==null)
            throw new UnknownAccountException();
        //判定用户是否已被禁用
        if (user.getValid()==0)
            throw new UnknownAccountException();
        //封装用户信息
        ByteSource credentialsSalt=ByteSource.Util.bytes(user.getSalt());
        SimpleAuthenticationInfo info=new SimpleAuthenticationInfo(
                user,
                user.getPassword(),
                credentialsSalt,
                getName()
        );
        //返回封装结果
        return info;
    }

    /*负责授权信息的获取和封装*/
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(
            PrincipalCollection principals) {
        //1.获取登录用户信息，例如用户id
        SysUser user=(SysUser)principals.getPrimaryPrincipal();
        Integer userId=user.getId();
        //2.基于用户id获取用户拥有的角色(sys_user_roles)
        List<Integer> roleIds=
                sysUserRoleDao.findRoleIdsByUserId(userId);
        if(roleIds==null||roleIds.size()==0)
            throw new AuthorizationException();
        //3.基于角色id获取菜单id(sys_role_menus)
        List<Integer> menuIds=
                sysRoleMenuDao.findMenuIdsByRoleIds(roleIds);
        if(menuIds==null||menuIds.size()==0)
            throw new AuthorizationException();
        //4.基于菜单id获取权限标识(sys_menus)
        List<String> permissions=
                sysMenuDao.findPermissions(menuIds);
        //5.对权限标识信息进行封装并返回
        Set<String> set=new HashSet<>();
        for(String per:permissions){
            if(!StringUtils.isEmpty(per)){
                set.add(per);
            }
        }
        SimpleAuthorizationInfo info=
                new SimpleAuthorizationInfo();
        info.setStringPermissions(set);
        return info;//返回给授权管理器

    }


}
